digitalmars.D.learn - Bug with alias const(type)? (DMD 2.003)

I'm writing a class that I'm trying to keep compatible with D version 1
but also playing with features of D version 2 (using DMD 1.020 and 2.003
respectively). For the compatibility, I was using a version block to
create aliases for const versions of one type for D 2 and just regular
non-const versions D 1.
The issue I'm having:
class A { }
class B( TYPE ) {
TYPE scalar;
TYPE[] array;
alias const( TYPE ) CONST_TYPE;
alias const( TYPE )[] CONST_ARRAY;
const:
// This member function compiles fine in DMD 2.003
CONST_ARRAY bar()
{
return array;
}
// This member function fails to compile in DMD 2.003 with
// the error: cannot implicitly convert expression
// (this.scalar) of type const A to constbug.A.
CONST_TYPE foo()
{
return scalar;
}
// Commenting out the above version and using the following
// works as expected.
// const(TYPE) foo()
// {
// return scalar;
// }
}
void main()
{
B!( A ) test = new B!( A );
}
Is it me, or is it rejecting valid code?